Originally Posted by carson356

today at work i had 2 380 SL's (same engine as both yours cars) that had similar stalling issues. one had the fuel mixture set way too lean, enrichening the mixture fixed it. and the other one had a defective ov relay. have either of you checked these two items? the easiest way to verify if the ov relay is working is remove the air cleaner and see if with the engine running that the frequency valve is working, it will be on the drivers side near the air intake. if it is buzzing or can be felt vibrating it is working.
you can also un plug the idle valve if the ov relay is good idle speed will raise, next would be to check the fuel mixture.